The complex mechanical systems are generally built by using some simple elements which are assembled by different connections such as bolted, riveted or welded joints. The frictional damping in joints provides the dominant damping mechanism compared to the material damping. This frictional damping depending on contact pressure is generally a nonlinear function of the vibration amplitude because of stick/slip phenomenon. The objective of the presented experimental study is to quantify the modal parameters of an assembled structure. Two experimental methods are proposed to identify the modal damping ratios of the first five eigenmodes versus the vibration amplitude. First the damping identification based on the FRF curve-fitting was used. Then the logarithmic decrement method was applied in the time-frequency domain by using the wavelet-based approach. Finally interferometric measurement was performed in order to observe the influence of the joints on the eigenmodes. The results provide the quantitative and qualitative evaluation of the assembly effect.

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